Affinity RSS issue

I have followed the new RSS feed from Affinity, and it keeps getting repeats in the display (unlike any other feed I have). I asked them to look at it, and they can’t see anything. So I grabbed the RSS yesterday and after the repeat today, and the only difference is the lastBuildDate. Therefore it appears to be a NewsBlur issue. Could you look at it please? Thanks!

https://affinityspotlight.com/articles/rss/

Okay, I looked at the similar items, and Samuel said: “It’s two things: the feed switches between cached URLs that change its guid, or if the guid is missing, its permalink. Also the entries may be too short to properly de-dupe, although I haven’t checked the feed. This is just what the cause is. In both cases, it’s the feed publisher’s fault, considering all the work NewsBlur does to de-dupe these things.”

What part of this is the problem please? I can pass it on.

 <item>
 <title>Understanding DPI</title>
 < description>
 <![CDATA[
 Learn what DPI is and when you should and shouldn&#039;t worry about it.
 ]]>
 </description>
 <link>
 https://affinityspotlight.com/article/understanding-dpi/
 </link>
 <category domain="https://affinityspotlight.com/articles/category/learning/">Learning</category>
 <pubDate>Wed, 05 Sep 2018 10:00:00 +0000</pubDate>
 <guid isPermaLink="true">
 https://affinityspotlight.com/article/understanding-dpi/
 </guid>
 <dc:creator>James Ritson</dc:creator>
 </item>